Process Control

Working of an Override Control  

Instrumentation, Process Control

Introduction The override control concept is a technique by which process variables are kept with in certain limits, usually for     protective purposes. Override control maintains the process in operation but within and under safer conditions.   Override control To illustrate override control, consider the simple process shown in Figure A hot, saturated liquid enters a process surge tank, and then it is then pumped into the process. Normally, the tank operates at the level shown, but if the level gets too low the liquid will not have enough net …

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Basics of PID controller (Proportional – Integral – Derivative)

Animation, Control System, Process Control

PID (Proportional – Integral – Derivative ) Controller Proportional The proportional term makes the current error signal multiplied with a gain (Kp).The result will be output signal. So output signal = Kp * Error_Signal Integral The integral term makes the current error signal value and duration multiplied by with a gain (Ki). The result will …

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Override Control

Control System, Process Control

Override It is sometimes necessary to limit a variable in order to maintain safe operation or protect process equipment. If this variable is a function of the system’s primary controlled variable, the two variables can be interlocked in an override system. The primary variable maintains control as long as the second variable does not exceed …

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